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Self-adaptive beam shaping method of beam space orthogonal FDM medulating system

A technology of adaptive beam and modulation system, applied in the direction of orthogonal multiplexing system, multi-frequency code system, multiplexing communication, etc., can solve the problem of reducing the accuracy of CSI estimation, not considering the influence of CSI estimation, training Issues such as limited sequence length

Inactive Publication Date: 2005-01-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The disadvantage of this method is that the robustness and accuracy of its CSI estimation are affected by the following two factors:
[0004] 1) The existence of strong co-channel interference is not considered, so the influence of the existence of strong interference on the CSI estimation of each array element is not considered
When strong interference is incident, due to the limited length of the training sequence, it is difficult to extract useful signal information, which greatly increases the error of CSI estimation or even fails completely
[0005] 2) Even if there is no strong co-channel interference, the interference between different multipath components will affect the CSI estimation and reduce the accuracy of the CSI estimation

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  • Self-adaptive beam shaping method of beam space orthogonal FDM medulating system
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  • Self-adaptive beam shaping method of beam space orthogonal FDM medulating system

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Embodiment Construction

[0043] Such as figure 1 , figure 2 As shown, for a better understanding of the present invention, the implementation of the method will be further described below in conjunction with the accompanying drawings and specific embodiments, and the example parameters are set as follows: the number of antenna array elements M=16, the OFDM guard interval length L g is 16 OFDM sampling lengths, with 4 multipath components and one co-channel interference incident, one of the multipath components is outside the guard interval, which is interference multipath, and the other three are useful multipath, and the wave arrival of each incident signal The angle is an independent random variable uniformly distributed between -90° and 90°, the time delay of useful multipath is taken as an independent random variable uniformly distributed within 0 to 16, the time delay of interfering multipath is taken as 18, and 4 multipath Radial constant power incident. The specific implementation process of...

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Abstract

The method is as following: DFT transform is carried out in space domain for signal vector received by array element; transform is carried back to wave beam space; each component of signal vector in wave beam space is corresponding to a receiving signal of one fixed beam former; correlation operation is carried out between each component of signal vector in wave beam space and a known adjustment sequence so as to obtain preliminary estimate of information of the wave beam channel; based on discrimination criterion, the wave beam of receiving interference and noise is determined. Setting correlation sequences values of these wave beams to zero; final estimate of channel information matrix is obtained from multiple paths abstraction of correlation sequences of each wave beam. Based on maximum S / N ratio rule, optimal weight vector in wave beam space is obtained, and then optimal weight vector in array element space is obtained. The invention raises precision of CSI estimation.

Description

technical field [0001] The invention relates to the technical field of wireless transmission of digital information, in particular to an adaptive antenna beam forming method of an Orthogonal Frequency Division Multiplexing Modulation (OFDM) system. Background technique [0002] Orthogonal frequency division multiplexing modulation, that is, OFDM technology is applied in the field of high-speed data transmission, which can effectively combat frequency selective fading. The application of adaptive antenna array in OFDM can suppress co-channel interference and multipath interference whose delay exceeds the guard interval, and obtain the optimal signal-to-interference-noise ratio (SINR). The adaptive antenna array weights and superimposes the received signals of each array element according to certain criteria, and adaptively forms beams in space, thereby suppressing interference and extracting useful signals. According to the position of beamforming in the signal processing fl...

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Application Information

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IPC IPC(8): H04J11/00H04L27/26
Inventor 刘波金荣洪耿军平范瑜
Owner SHANGHAI JIAO TONG UNIV
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